The agricultural land is hilly and the irrigation poor.
这片农田多丘陵，而且灌溉条件很差。
Irrigation is needed to make crops grow in dry regions.
干旱地区需要灌溉才能使作物生长。
Excess water from irrigation sinks down into the water table.
灌溉产生的多余水分渗入地下水。
Rivers and lakes provide us with water transport and irrigation.
江河湖泽给我们以舟楫和灌溉之利。
However, water used in irrigation is often sourced unsustainably.
然而，灌溉用水的来源往往不是可持续的。
They increased the need for extensive irrigation in the Teotihuacán Valley.
他们在特奥蒂瓦坎山谷广泛灌溉的需要增加了。
Only by using modern irrigation methods can we reduce water shortage in agriculture.
只有使用现代的灌溉方法，我们才能减少农业用水短缺的情况。
Certain irrigation practices degrade soil quality and reduce agricultural productivity.
某些灌溉措施会降低土壤质量，降低农业生产力。
Small blockages or collapses of the canal would choke the intricate irrigation networks.
运河的小堵塞或崩塌会阻塞错综复杂的灌溉网络。
In the United States, by contrast, 41% water goes for agriculture, almost all of it for irrigation.
相反，美国41%的水投向了农业，并几乎全都用在了灌溉上。
In poor, dry regions, untreated wastewater is the only viable irrigation source to keep farmers in business.
在贫穷、干旱的地区，未经处理的废水是让农民维持生计的唯一可用灌溉资源。
The low utilization efficiency has resulted from the adoption of some traditional Chinese irrigation methods.
利用效率低的原因是采用了中国一些传统的灌溉方式。
The project finances small scale irrigation systems, feeder roads and other types of community infrastructure.
该项目资助小型灌溉系统、支路和其他类型的社区基础设施。
"Efficient" irrigation is often used to describe systems that result in 85% of the water disappearing in vapor.
“有效”灌溉通常指的都是一些让85%的水最终以水汽的形式逸散的作法。
To make matters worse, some of the traditional Chinese irrigation methods have wasted an astonishing amount of water.
更糟糕的是，一些中国传统的灌溉方式浪费的水量令人惊讶。
Donna helped the people of the village to organize an irrigation project, and she also advised them on planting crops.
唐娜帮助村民们规划了一个灌溉工程，还建议他们种庄稼。
Donna helped the people of the village to organize an irrigation project, and she also advised them on planting corps.
唐娜帮助村里的人们建造了一个灌溉工程，还给予他们关于种植庄稼的建议。
The ensuing rapid expansion of irrigation agriculture, especially from the 1950s onward, transformed the economy of the region.
随之而来的灌溉农业的迅速发展，特别是从20世纪50年代以来，改变了该区域的经济。
Drip, or "micro" irrigation, as the name suggests, is stingier with the water, delivering it to the roots of plants drop by drop.
滴灌，或者“微”灌溉，顾名思义，是更吝啬于水，把水一滴一滴地滴到植物的根部。
Millions of irrigation wells in many countries are now pumping water out of underground sources faster than rainfall can refill them.
在许多国家，数以百万计的灌溉井现在从地下水源抽水的速度，超过了降雨所能再次填满的速度。
More irrigation works would have to be built to feed the growing population, and this resulted in more power and wealth for the elite.
国家必须修建更多的灌溉工程来养活不断增长的人口，这为精英阶层带来了更多的权力和财富。
It was this that made the organization of irrigation, particularly the building of canals to channel and preserve the water, essential.
正是这点使得灌溉的统筹，特别是建造运河以疏导和保护水，变得至关重要。
Better irrigation can dramatically improve crop yield and about 40% of the world's food supply is currently derived from irrigated land.
更好的灌溉可以显著提高作物产量；目前，全球约40%的粮食供应都来自于灌溉地。
A group of corn farmers stands huddled around an agronomist and his computer on the side of an irrigation machine in central South Africa.
南非中部，一群玉米农挤成一团，围着一名农学家和他放在灌溉机旁的电脑。
One of the advantages of modern irrigation methods is that they alone can save 20-30 percent of the present volume of wasted irrigation water.
现代灌溉方法的优点之一是，仅凭它们就可以节省目前灌溉用水浪费量的20%-30%。
But this isn't a long paper, so are you going to need to pick a specific area of pre-modern agriculture, like irrigation or food crops of ancient Greece.
但这不是一篇很长的论文，所以你要选定一个现代以前农业的特定领域，像是灌溉技术，或古希腊的粮食作物。
To start with, it forced the population to abandon the nomad's life and became sedentary, to develop methods of storage and, often, systems of irrigation.
首先，它会迫使人们放弃游牧生活定居下来，因而使人们开发存储的方法，往往也会开发灌溉系统。
When this water is used for agricultural irrigation, farmers risk absorbing disease-causing bacteria, as do consumers who eat the produce raw and unwashed.
当这种水用于农业灌溉时，农民有接触到致病细菌的风险，那些食用了未加工和未经清洗的农产品的消费者也会面临这种风险。
This scenario begins with the planting of hyperaccumulating species in the target area, such as an abandoned mine or an irrigation pond contaminated by runoff.
这种情形始于在目标地区（如废弃矿井或被污水污染的灌溉池）种植超积累物种。
As water tables have fallen and irrigation wells have gone dry, China's wheat crop, the world's largest, has declined by 8% since it peaked at 123 million tons in 1997.
由于地下水位下降，灌溉井干涸，居于世界之首的中国小麦产量，已经从1997年1.23亿吨的峰值下降了8%。
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